amateur

a.业余的 n.业余爱好者

altitude, alto, altogether, altruism, altruist, altruistic, altruistically, alum, aluminium, aluminum, alumna, alumnus, alveolar, always, am, amalgam, amalgamate, amalgamation, amanuensis, amass, amateurish, amateurishly, amateurism, amatory, amaze, amazement, amazing, amazingly, amazon, Amazonia, amazonian, ambassador, ambassador-at-large, ambassadorial, ambassadress, amber, amber-like, ambergris, ambi-, ambidextrous,